High-temperature tensile properties of an aluminum quasicrystal-forming alloy manufactured by laser powder bed fusion

Author(s)

de Araujo, Aylanna P. M. ; Kiminami, Claudio S. ; Uhlenwinkel, Volker ; Gargarella, Piter

• Document type: Journal article
• Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 886, p. 10-pg., 2023-10-17.

Abstract

Normalized tensile samples of Al-4Fe-3Cr-2Ti (wt.%) alloy were successfully fabricated by laser powder bed fusion (LPBF) additive manufacturing. The alloy's tensile properties and microstructure were investigated at room and high-temperature (up to 500 degrees C). This Al-Fe-Cr-Ti alloy exhibits exceptional thermal stability and outstanding mechanical performance at temperatures of up to 500 degrees C. A particularly interesting feature is the alloy's yield strength values, which reach -300 MPa at 300 degrees C and -180 MPa at 400 degrees C. The outstanding mechanical behavior of this alloy at high temperatures is attributed to the in situ precipitation of ultrafine icosahedral quasicrystalline (i-QC) particles endowed with high thermal stability. These values are notably higher than those achieved for A319, 6061-T6 and Al-8%wt.Cu-Mg-Ag cast alloys - three of the most common heat-resistant Al alloys, and higher than commercially available Al-based alloys for LPBF. Based on hardness measurements and the bimodal composite microstructure, we propose a model to predict this alloy's yield strength. This model shows a good agreement with the experimental results and can be used to maximize the alloy's tensile strength. This work describes a lightweight aluminum alloy with outstanding high temperature tensile strength within a wide range of temperatures, in addition to being additively processable and affordable. (AU)

• FAPESP's process: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys
• Grantee: Claudio Shyinti Kiminami
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/27031-4 - Effect of process parameters on the metallurgical characteristics of additive-manufactured alloys
• Grantee: Piter Gargarella
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 18/04209-5 - Correlation between microstructure and mechanical properties of a quasicrystalline phase former alloy obtained by selective laser melting
• Grantee: Aylanna Priscila Marques de Araújo
• Support Opportunities: Scholarships in Brazil - Master